SDZ Construction: Single Firing Point, Single Target Inter-service Resident Range Safety Course (Intermediate)

SDZ Construction:Single Firing Point, Single TargetInter-service Resident Range Safety Course (Intermediate)

August 2003

SDZ Construction FundamentalsAll SDZs, regardless of complexity, are drawn from a point or points of reference.

To construct an accurate and precise SDZ, you will need the following:

Compass for drawing circles and arcs

Protractor for measuring angles

Plotting scale for measuring distances

Fine-point pencil for drawing accuracy

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Degrees Scale

Mils Scale

Index

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The M2 may be mounted on ground mounts and most vehicles as an anti-personnel and anti-aircraft weapon.

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Weapon:

Ammo:

Distance X:

Area A:

Map Scale:

Map Sheet:

Map Series:

Map Edition:

Date:

Name:

Small Arms Legend (Cone)

August 2003

Constructing a Cone-Shaped SDZConstruct a cone-shaped SDZ for the M2 .50 MG using M2 ball ammo.

Map scale: 1:50,000.

Distance X for this weapon/ammo is given in DA-PAM 385-63, Appendix B, Table B-1.

Cone-shaped SDZ dimensions are shown in DA-PAM 385-63, Figure 6-1.

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What’s the Gun Target Line?The Gun Target Line, or GTL, is a line drawn between the firing point and the target. It is also referred to as the line of fire.

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Plot the firing point.

Gun TargetLine

Firing Point

Establish the gun target line.

Plot the target.

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What is Distance X?Distance X is the maximum distance a projectile, to include guided missiles and rockets, will travel when fired or launched at a given quadrant elevation with a given charge or propulsion system.

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From Table B-1, find Distance X M2 ball.

Distance X = 6500m

Annotate Distance X on the legend.

Dis

tan

ce X

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Determine the Dispersion AreaThe Dispersion Area is the area within the Surface Danger Zone located between the gun target line and the Ricochet Area.

This area accounts for human error, gun or cannon tube wear, propellant temperature, etc.

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At the firing point, measure 5° with a protractor from the left and right of the gun target line.

Draw tic marks.

5°

Dis

tan

ce X

5°

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Gun TargetLine

5°

DispersionArea

This completes the Dispersion Area.

To establish the limits of the Dispersion Area, draw a straight line from the firing position through each tic mark out to Distance X.

Dis

tan

ce X

5°

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Ricochet AreaThe Ricochet Area is located to the left and right of the Dispersion Area and contains projectiles after they make contact with the target medium.

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At the firing point, measure 5° with a protractor from the left and right limits of the Dispersion Area.

Draw tic marks.DispersionArea

5°

Dis

tan

ce X

5°

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DispersionArea

RicochetArea

This completes the Ricochet Area.

To establish the lateral limits of Ricochet Area, draw a straight line from the firing position through each tic mark out through Distance X.

5°

Dis

tan

ce X

5°

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Area AArea A is the secondary danger area, or buffer zone, that laterally parallels the Ricochet Area and contains fragments, debris, and components from frangible or explosive projectiles and warheads functioning on the right or left edge of the Ricochet Area.

Area A measurement for direct-fire small arms without explosive projectiles is 100 meters.

August 2003

To establish Area A, lightly draw lines perpendicular to the right and left limits of the Ricochet Area. Ricochet

Area

DispersionArea

Draw tic marks at 100 meters.

Draw lines parallel to the limits of the Ricochet Area through the tic marks.

Dis

tan

ce X

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At the firing point, measure 30° with a protractor from the left and right limits of the Ricochet Area.

Draw tic marks.

Draw a straight line from the firing point through each tic mark.

RicochetArea

DispersionArea

30°

Dis

tan

ce X

30°

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30°

From the firing point, scribe an arc between the left and right limits of Area A. Use Distance X as the radius.

This completes Area A.

RicochetArea

DispersionArea

To complete the SDZ, erase all unnecessary lines.

Area A

Annotate Area A on the legend.

Dis

tan

ce X

30°

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RicochetArea

DispersionArea

Area A

From the firing point, scribe an arc between the left and right limits of Area A. Use Distance X as the radius.

This completes Area A.

To complete the SDZ, erase all unnecessary lines.

Annotate Area A on the legend.

Dis

tan

ce X

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Weapon: M2 .50 Machine Gun

Ammo: M2 Ball

Distance X: 6500m

Area A: 100m

Map Scale: 1:50,000

Map Sheet:

Map Series:

Map Edition:

Date:

Name:

Small Arms Legend (Cone)